Blender renders the same camera view even after camera is deleted!
If I understand the question correctly, you want to set it up as a sequence and switch cameras with a marker. I think this question is a duplicate of How swap views between multiple cameras?.

You can create markers on the timeline with the M key. Then select the camera you want to bind to that marker and hit Ctrl+B. As soon as your timeline reaches that marker the camera will switch. It is important that both the marker and the camera are selected.

So if you're doing stills, you'd only need however many frames as cameras that you have. 

Edit: (select your camera and use CTRL+Num 0) ...